India has been encouraging nitrogen use by giving subsidies to farmers.

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Everyone has to eat and, to grow the foods we need, we have to use nitrogen fertilizers.

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The only similarity is that we use liquid nitrogen.

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The process that smokestack "scrubbers" use to reduce nitrogen oxide and sulfur dioxide emissions creates high-quality synthetic gypsum, said Robert E.

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They also use less water and nitrogen.

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Or nitrogen emissions (more exactly, NOx) from the use of artificial fertilisers contribute to climate change which will reduce crop yields.

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All organic crop rotations contain three to four years of no ploughing because grass leys use the sun's energy to fix nitrogen for subsequent crops in place of oil-based artificial fertiliser.

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All life forms on earth use six elements: oxygen, carbon, hydrogen, nitrogen, phosphorus and sulfur.

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Milesi, who uses satellite data to study the effects of urbanization, estimates Americans use as much as 19 trillion gallons of water and 2.4 million metric tons of nitrogen-based fertilizer annually to care for their lawns.

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The engine would use at least 25% less fuel and, he claims, its emissions of carbon dioxide and nitrogen oxide would be cut by three-quarters because of its unique ignition properties.

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